Hide the blurb for custom-manual types

Fixes: 377691826
Test: manual
Flag: android.app.modes_ui
Change-Id: I3c959f32c7ae1cc2c95fb4e9180e2f871ed3ee91

src/com/android/settings/notification/modes/ZenModeBlurbPreferenceController.java

@@ -40,6 +40,11 @@ class ZenModeBlurbPreferenceController extends AbstractZenModePreferenceControll
         super(context, key);
     }
 
+    @Override
+    public boolean isAvailable(@NonNull ZenMode zenMode) {
+        return !zenMode.isCustomManual();
+    }
+
     @Override
     void updateState(Preference preference, @NonNull ZenMode zenMode) {
         preference.setTitle(getModeBlurb(zenMode));